director david petraeus was questioned by congress today about the september attack on the u.s. consulate in benghazi, libya. petraeus appeared behind closed doors at the capitol. he spoke with members of the house and senate intelligence committees in a secure underground hearing room. david martin reports. >> reporter: david petraeus sped away from the capitol in his limo, leaving members of congress to describe the former c.i.a. director's closed-door testimony. according to republican senator saxby chambliss, petraeus never had any doubt about what to call the attack on the american consulate in benghazi. >> there was no question in the mind of anybody that this was an act of terrorism from the get-go. >> reporter: by the morning after, the c.i.a. knew some of the attackers who killed four americans were members of extremist groups. yet president obama refraind from calling it a terrorist attack when he spoke with steve kroft on "60 minutes" that afternoon. >> do you believe this was a terrorist attack? >> well, it's too early to know exactly how this came about, what group